Lecture Notes_1-2_Semiconductors_2014

Thus we have an increased conductivity in si the boron

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Unformatted text preview: ons, so it produces an extra electron to the conduction band and increases the conductivity. 37 Figure (a) shows that the 5th valence electron of As is attracted to the positively charged As ion in the lattice. It’s like a hydrogen atom. However, its binding energy is small (of the order of 50 meV; room temperature 300K is 26 meV), so practically all of the 5th valence electrons are free to move in the conduction band. On Slide 35, we see Si has 5 x 1022 atoms per cm3, but As concentration...
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